The opening in the box girder bridge is 1.50 meters high and 3 meters wide. Above the box girder bridge there is still 1.50 meters of earth, stones, concrete, etc. The water runs over the bridge, but can only pass through an opening of 1.50 meters, above which the water is stopped by the stones, and so on. A second stream comes from the right and flows into the first stream. It can be seen that the water level BEFORE the bridge is only slightly higher than the water level BEYOND the bridge. Is there a siphon effect of the box girder bridge? Or is the water level beyond the bridge kept that high by the second stream? Thanks for an answer.
Answer
There is indeed a kind of siphon effect.
When the boiler is completely filled with water (water level upwards higher than the top of the boiler), the boiler becomes a pressurized pipe. During the flow, there is a loss of pressure as a result of the inflow and the friction with the walls, as a result of which the water level downstream of the shaft is somewhat lower. Although the downstream stream can influence the flow, it does not directly influence the difference in level between the upstream and downstream side of the tube.
Answered by
prof. dr.ir. Ronnie Verhoeven
hydraulics, water management, sediment transport, transport of water
http://www.ugent.be
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